Neutron single-flow method for efficient production of Cf-252 in high-flux fast reactor

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Engineering and Design Pub Date : 2024-11-08 DOI:10.1016/j.nucengdes.2024.113680

Yu Xin , Qingquan Pan , Lianjie Wang , Bangyang Xia , Yun Cai , Xiaojing Liu , Jinbiao Xiong

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Abstract

Targets are irradiated in high-flux reactors to produce transplutonium isotope. High neutron flux favors the production of transplutonium isotope. Fast reactors can achieve a higher neutron flux operating at the same power density, with the advantages of high neutron energy, controllability of energy spectrum and large irradiation volume. We investigate transplutonium isotopes production in High-Flux Fast Reactor (HFFR) focusing on ²⁵²Cf, proving that fast reactor has better production economy. Thermalized neutron spectrum promotes the production of transplutonium isotopes. Constructing a thermal neutron environment in fast reactor produces a significant quantity of thermal neutrons, and the thermal neutron overflow from the irradiation channel results in an increased fission power in the fuel region. We proposed a neutron single-flow method that restricts thermal neutrons in the irradiation channel from entering the fuel region and achieves a partition distribution of neutrons. This method has achieved a maximum reduction of 83% in fission power of fuel region around the irradiation channel without affecting neutron flux in the irradiation channel. The neutron single-flow method offers technical support for producing transplutonium isotopes in fast reactors.

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在高通量快堆中高效生产 Cf-252 的中子单流法

在高通量反应堆中对目标进行辐照，以生产反式钚同位素。高中子通量有利于生产跨钚同位素。快堆可以在相同功率密度下实现更高的中子通量，具有中子能量高、能谱可控和辐照量大等优点。我们研究了在高通量快堆（HFFR）中生产反式钚同位素的情况，重点是 252Cf，证明快堆具有更好的生产经济性。热化中子谱促进了反式钚同位素的生产。在快堆中构建热中子环境会产生大量热中子，辐照通道溢出的热中子会增加燃料区的裂变功率。我们提出了一种中子单流方法，限制辐照通道中的热中子进入燃料区，实现中子的分区分布。这种方法在不影响辐照通道内中子通量的情况下，将辐照通道周围燃料区的裂变功率最大降低了 83%。中子单流法为在快堆中生产反式钚同位素提供了技术支持。

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.